Jesse Lackey wrote:
> According to the datasheet (page 32 table 2-3), for full-speed USB
> 48Mhz is required.

The USB peripheral requires a 48MHz clock, but that doesn't mean the
processor has to run at that speed.  When using one of these chips, you
really have to study the clock structure diagram on page 24 of the
datasheet.  The USB PICs have a rather different clock structure with
different options and restrictions from other PIC 18s.  For example, you ca=
n
have the USB peripheral clocked at 48MHz as required while the CPU is
clocked at 16MHz, all from a 8MHz crystal.  This is in fact exactly what I
do in the LProg PIC programmer (http://www.embedinc.com/products/lprog).


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